CN117307638A

CN117307638A - Hydraulic driving device and automobile

Info

Publication number: CN117307638A
Application number: CN202210733847.5A
Authority: CN
Inventors: 韩富秋; 张伟松; 林胜
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2022-06-25
Filing date: 2022-06-25
Publication date: 2023-12-29

Abstract

The application discloses a hydraulic driving device and an automobile, wherein the hydraulic driving device comprises an outer shell, a movable sleeve and an elastic resetting piece, the outer shell is provided with a travel cavity, and the movable sleeve comprises a rod body and a slide guiding protrusion which are fixedly connected; a part of the rod body and the sliding guide protrusion are positioned in the travel cavity, and the sliding guide protrusion is contacted with the cavity wall of the travel cavity so that a part of the travel cavity forms a hydraulic cavity; the other part of the rod body is positioned at the outer side of the stroke cavity; after hydraulic oil is injected into the hydraulic cavity, the pressure is increased so as to push the slide guide boss and the rod body to move towards the parking direction; after the hydraulic cavity is depressurized, the rod body moves towards the parking releasing direction, and the parking releasing direction is opposite to the parking direction. The parking is realized by utilizing the pressure generated by hydraulic oil in the hydraulic cavity, the parking force is large, the parking can be rapidly performed, the parking reliability is high, and the phenomenon of sliding can not occur even if the parking is performed for a long time.

Description

Hydraulic driving device and automobile

Technical Field

The application relates to the technical field of automobiles, in particular to a hydraulic driving device and an automobile.

Background

After the automobile stops running, in order to prevent the automobile from sliding and avoid safety accidents, the automobile is provided with a parking system. The parking system is used for locking the wheel after the automobile stops running, so that the parking of the automobile is realized.

However, the existing parking system has weak parking force, poor parking reliability and easy occurrence of slipping after long-time parking.

Disclosure of Invention

An object of the application is to provide a hydraulic drive device and car, parking power is stronger. The parking reliability is stronger, and even if parking is performed for a long time, the phenomenon of sliding can not occur.

A first aspect of the present application provides a hydraulic drive apparatus comprising: the device comprises an outer shell, a movable sleeve and an elastic resetting piece, wherein the outer shell is provided with a travel cavity, and the movable sleeve comprises a rod body and a slide guiding protrusion which are fixedly connected; a part of the rod body and the sliding guide protrusion are positioned in the travel cavity, and the sliding guide protrusion is contacted with the cavity wall of the travel cavity so that a part of the travel cavity forms a hydraulic cavity; the other part of the rod body is positioned at the outer side of the stroke cavity; after hydraulic oil is injected into the hydraulic cavity, the pressure is increased so as to push the slide guide boss and the rod body to move towards the parking direction; after the hydraulic cavity is depressurized, the rod body moves towards the parking releasing direction, and the parking releasing direction is opposite to the parking direction.

In some embodiments, the hydraulic driving device further includes an elastic reset piece, and the elastic reset piece is located in the travel cavity and sleeved on the rod body; the two ends of the elastic reset piece are respectively and fixedly connected with the rod body and the cavity wall of the stroke cavity; when the rod body moves towards the parking direction, the elastic reset piece is compressed; after the pressure of the hydraulic cavity is relieved, the elastic reset piece resets to drive the rod body to move towards the parking releasing direction.

In some embodiments, the hydraulic driving device further comprises a locking piece and a limiting piece, the limiting piece is in transmission connection with the rod body, and the limiting piece can rotate around the parking direction; the locking piece is used for locking the limiting piece so as to limit the rotation of the limiting piece and limit the movement of the rod body; after hydraulic oil is injected into the locking cavity, the pressure is increased, and the locking piece releases the limit of the limiting piece, so that the limiting piece releases the limit of the rod body.

In some embodiments, the outer housing is provided with an axial through hole, the outer housing comprises a baffle plate which separates the axial through hole into a travel cavity and a mounting hole; the hydraulic driving device also comprises a locking piece and a limiting piece; one part of the limiting piece is positioned in the travel cavity and is in transmission connection with the rod body; the other part of the limiting piece penetrates through the baffle plate and extends into the mounting hole, and the limiting piece can rotate around the parking direction; a part of the locking piece is positioned in the mounting hole and is matched with the limiting piece so that a part of the mounting hole forms a locking cavity; the locking piece locks the limiting piece and limits the rotation of the limiting piece; after hydraulic oil is injected into the locking cavity, the pressure is increased, and the locking piece releases the limit of the limiting piece, so that the limiting piece releases the limit of the rod body.

In some embodiments, the limiting piece comprises a rotating rod and a limiting rod, wherein a part of the rotating rod is positioned in the travel cavity and is in threaded connection with the rod body; the other part of the rotating rod penetrates through the baffle plate and extends into the mounting hole, and the limiting rod is positioned in the mounting hole and matched with the locking piece so that a part of the mounting hole forms a locking cavity.

In some embodiments, the limiting member is connected with a gear, the rod body is connected with a rack, and the gear is meshed with the rack.

In some embodiments, the locking member includes a locking lever and a locking housing; at least part of the locking shell is positioned in the mounting hole and fixedly connected with the hole wall of the mounting hole, and the locking shell is opposite to and spaced from the limit rod, so that a part of the mounting hole forms a locking cavity; the locking shell is provided with a locking hole; one part of the locking rod is positioned in the locking hole, and the other part of the locking rod is positioned in the locking cavity and is detachably connected with the rotating rod; after hydraulic oil is injected into the locking cavity, the pressure is increased, and the locking rod is pushed to move towards the parking direction, so that the locking rod is separated from the rotating rod.

In some embodiments, the limiting rod is provided with a limiting groove, and a first limiting saw tooth is arranged in the limiting groove; the locking rod comprises a locking section and a sliding section which are fixedly connected, the locking section is provided with second limiting saw teeth, the locking section is located in the limiting groove, the first limiting saw teeth are meshed with the second limiting saw teeth, one part of the sliding section is located in the locking cavity, and the other part of the sliding section is located in the locking hole.

In some embodiments, the locking lever further comprises an anti-rotation protrusion fixedly connected with the sliding section and protruding relative to the outer peripheral surface of the sliding section; the wall surface of the locking hole is provided with an anti-rotation groove, and the anti-rotation protrusion is positioned in the anti-rotation groove to limit the rotation of the locking rod.

In some embodiments, the locking member further comprises a locking spring; the locking elastic piece is positioned in the locking hole, and two ends of the locking elastic piece are respectively fixedly connected with the locking rod and the wall of the locking hole; when the locking rod moves towards the parking direction, the locking elastic piece is compressed; after the locking cavity is depressurized, the locking elastic piece is reset to drive the locking rod to move in the braking releasing direction so as to enable the locking rod to be connected with the rotating rod.

In some embodiments, the hydraulic drive device further includes a first planar bearing mounted in the mounting hole and located between the baffle plate and the stop lever, and a ball of the first planar bearing contacts the stop lever.

In some embodiments, the hydraulic drive device further includes a first spacer mounted in the mounting hole and positioned between the first planar bearing and the barrier.

In some embodiments, the hydraulic drive device further includes a second planar bearing mounted in the locking cavity and positioned between the stop lever and the locking member, the stop lever being in contact with the balls of the second planar bearing.

In some embodiments, the hydraulic drive device further includes a second shim mounted within the locking cavity and positioned between the second planar bearing and the locking member.

In some embodiments, the hydraulic drive device further comprises a spacer sleeve disposed on the spacing member to separate the spacing member from the baffle plate.

In some embodiments, the hydraulic driving device further comprises a flexible protective cover, the flexible protective cover is sleeved on the rod body and the outer shell, and two opposite ends of the flexible protective cover are respectively and fixedly connected with the rod body and the outer shell.

In some embodiments, the moving sleeve further comprises a stop protrusion, the stop protrusion is fixedly connected with the rod body, the cavity wall of the travel cavity is formed with an abutting wall, and when the rod body moves towards the parking releasing direction, the stop protrusion abuts against the abutting wall.

A second aspect of the present application provides an automobile comprising a vehicle frame and a park system according to any one of the first aspects of the present application, the hydraulic drive being mounted to the vehicle frame.

In this application, pressure increases after hydraulic pressure intracavity pours into hydraulic oil into, promotes to remove the cover and removes to the parking direction, removes the cover and drives the parking zip fastener and remove, and the parking zip fastener drives parking device and carries out the parking action. After the pressure of the hydraulic cavity is relieved, the movable sleeve moves towards the parking releasing direction, and the movable sleeve drives the parking zipper to move. The parking lock drives the parking device to execute the parking releasing action. From the above, in this embodiment, parking is achieved by using the pressure generated by the hydraulic oil in the hydraulic chamber, the generated force (parking force) for pulling the parking zip lock is large, parking can be performed quickly, and the parking reliability is high.

In this embodiment, hydraulic oil is injected into the locking cavity, so that the pressure in the locking cavity is increased, and the restriction of the locking piece on the limiting piece is released by using the pressure, so that the limiting piece can rotate. Then, hydraulic oil is injected into the hydraulic cavity, the pressure of the hydraulic cavity is increased, the movable sleeve is driven to move towards the parking direction by the aid of the pressure, at the moment, the limiting piece rotates along with the movement of the movable sleeve, the movement of the movable sleeve cannot be influenced, the movable sleeve drives the parking zipper, the parking zipper pulls the parking assembly, and further the first brake shoe and the second brake shoe are far away from each other, so that the first brake shoe and the second brake shoe brake the brake drum. Then the locking cavity is decompressed, so that the limiting piece is locked again by the locking piece, the limiting piece cannot rotate, and the limiting piece can limit the movement of the moving sleeve. From the above, in this embodiment, parking is achieved by using the pressure generated by the hydraulic oil in the hydraulic cavity, the generated force (parking force) for pulling the parking zip lock is large, parking can be performed rapidly, and the parking reliability is high.

Drawings

In order to more clearly illustrate the technical solutions of the present application, the drawings that are required to be used in the embodiments will be briefly described below.

Fig. 1 is a schematic structural diagram of a parking system according to an embodiment of the present application.

Fig. 2 is a schematic structural view of the parking system shown in fig. 1 from another perspective.

Fig. 3 is a schematic view of a split structure of the parking system shown in fig. 1.

Fig. 4 is a schematic structural view of a hydraulic driving device of the parking system shown in fig. 3.

Fig. 5 is a schematic view of the hydraulic drive apparatus shown in fig. 4 in a split configuration.

Fig. 6 is a schematic cross-sectional view of the hydraulic drive apparatus shown in fig. 4.

Fig. 7 is a partial enlarged view of fig. 6.

Fig. 8 is another enlarged partial view of fig. 6.

Fig. 9 is a schematic view of the construction of the travel sleeve of the hydraulic drive device shown in fig. 5.

Fig. 10 is a schematic view of the structure of the locking sleeve of the hydraulic drive apparatus shown in fig. 5.

Fig. 11 is a schematic view of the construction of the traveling case of the hydraulic drive apparatus shown in fig. 5.

Fig. 12 is a schematic view of the structure of the stopper of the hydraulic drive device shown in fig. 5.

Fig. 13 is a schematic view of a further view of the limiter of the hydraulic drive apparatus shown in fig. 5.

Fig. 14 is a schematic structural view of a locking member of the hydraulic drive apparatus shown in fig. 5.

Fig. 15 is a schematic structural view of a locking lever of the locking member shown in fig. 14.

Fig. 16 is a schematic structural view of the connection sleeve of the locking element shown in fig. 14.

Fig. 17 is a schematic structural view of a locking plug of the locking member shown in fig. 14.

Fig. 18 is a schematic structural view of a parking device of the parking system shown in fig. 1.

Fig. 19 is a schematic structural view of the parking device shown in fig. 18 from another view angle.

Fig. 20 is a schematic view of a split structure of the parking apparatus shown in fig. 18.

Fig. 21 is a schematic structural view of a support plate of the parking device shown in fig. 20.

Fig. 22 is a schematic structural view of a first shoe pressing spring of the parking apparatus shown in fig. 20.

Fig. 23 is a schematic view showing a structure of the first shoe spring shown in fig. 22 from another view angle.

Fig. 24 is a schematic view of the first and second brake shoes of the parking device of fig. 20.

Fig. 25 is a schematic structural view of a connection spring of the parking device shown in fig. 20.

Fig. 26 is a schematic structural view of a fixing bracket of the parking device shown in fig. 20.

Fig. 27 is a schematic structural view of a parking assembly of the parking apparatus shown in fig. 20.

Fig. 28 is a schematic view of a split structure of the parking assembly shown in fig. 27.

Fig. 29 is a schematic structural view of the parking apparatus shown in fig. 18 at still another view angle.

Fig. 30 is a schematic structural view of the parking apparatus shown in fig. 18 from a further view angle.

Fig. 31 is a schematic structural view of a parking lock of the parking system shown in fig. 3.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.

The embodiment of the application provides an automobile, which comprises an automobile frame, wheels, a brake drum and a parking system, wherein the automobile frame comprises an automobile frame and an automobile chassis. The wheels and the parking system are both arranged on the vehicle frame, and the brake drum is fixedly connected with the wheels. When the wheels rotate, the automobile is driven to advance or retreat, and the brake drum and the wheels synchronously rotate. The parking system is used for locking or unlocking the brake drum, and when the brake drum is locked, the wheels stop rotating, and at the moment, the automobile is braked; when the brake drum is released, the wheels can rotate, and the automobile can normally advance or retreat.

Referring to fig. 1 to 3, a parking system 1000 includes a hydraulic driving apparatus 100, a parking apparatus 200, a parking lock 500, and a support floor 600. One end of the parking lock 500 is connected to the hydraulic drive device 100, and the other end of the parking lock 500 is connected to the parking device 200. The hydraulic driving device 100 drives the parking lock 500 to move, so that the parking lock 500 drives the parking device 200 to brake or release the brake drum. The hydraulic drive apparatus 100 and the parking apparatus 200 are respectively connected to the support base 600. Wherein the hydraulic drive device 100 is fixedly connected to the support floor 600 by four fasteners 601, the four fasteners 601 securing the support floor 600 and the hydraulic drive device 100 to the vehicle frame.

Referring to fig. 4 to 6, the X1 direction shown in fig. 6 is a movement to the right, i.e., a parking direction, and the X2 direction shown in fig. 6 is a direction to the left, i.e., a direction to release the parking. The hydraulic drive apparatus 100 includes an outer housing 110, a moving sleeve 120, a stopper 130, an elastic restoring member 140, and a locking member 150.

The outer housing 110 is provided with a travel chamber 177 and a lock chamber 102 isolated from each other. The moving sleeve 120 comprises a rod body 121 and a sliding guide protrusion 122 which are fixedly connected, wherein the sliding guide protrusion 122 protrudes relative to the outer peripheral surface of the rod body 121; a portion of the rod 121 and the slide guide 122 are located in the stroke chamber 177, and the slide guide 122 abuts against a chamber wall of the stroke chamber 177 to divide the stroke chamber 177 into a hydraulic chamber 101 and a movable chamber; the moving sleeve 120 is movable in the stroke chamber 177 in the axial direction of the hydraulic drive 100. One part of the limiting piece 130 is positioned in the stroke cavity 177 and is in transmission connection with the movable sleeve 120, and the other part of the limiting piece 130 is positioned in the locking cavity 102; the limiter 130 is rotatable around the axis of the hydraulic drive 100. The elastic reset piece 140 is positioned in the movable cavity and sleeved on the movable sleeve 120 and the rod body 121, and two opposite ends of the elastic reset piece 140 are respectively fixedly connected with the rod body 121 and the cavity wall of the movable cavity; a portion of the locking member 150 is positioned within the locking cavity 102 and is capable of locking the stop member 130 such that the stop member 130 limits movement of the shift collar 120.

The limiting member 130 is in driving connection with the moving sleeve 120, specifically, the limiting member 130 may be in threaded connection with the moving sleeve 120, and when the limiting member 130 is not locked by the locking member 150, the limiting member 130 rotates along the axial direction of the moving sleeve 120 when the moving sleeve moves along the axial direction. The limiting piece 130 can also be connected with the moving sleeve 120 through a gear and rack structure in a transmission way, specifically, the periphery of the limiting piece 130 is fixedly connected with a gear, the inside of the moving sleeve 120 is provided with a rack, the gear is meshed with the rack, when the moving sleeve 120 moves along the axial direction of the moving sleeve, the rack is driven to move, the rack drives the gear to rotate, and the gear drives the limiting piece 130 to rotate.

When the automobile normally runs, the locking piece 150 locks the limiting piece 130, so that the limiting piece 130 limits the movement of the movable sleeve 120, when the automobile needs to stay, under the condition that the pressure of the injected liquid in the locking cavity 102 is increased, the locking piece 150 is pressed to release the limiting piece 130, under the condition that the pressure of the injected liquid in the hydraulic cavity 101 is increased, the movable sleeve 120 is pressed to move rightward along the axial direction of the hydraulic driving device 100, the limiting piece 130 rotates around the axial direction of the hydraulic driving device 100, and the elastic reset piece 140 is compressed by the movable sleeve 120; the moving sleeve 120 drives the parking lock 500 to move rightward along the axial direction of the hydraulic driving device 100, and the parking lock 500 drives the parking device 200 to perform a braking action.

After the locking cavity 102 is depressurized, the locking member 150 is switched from the release lever 121 to the locking lever 121, so that the moving sleeve 120 is stationary relative to the outer housing 110, and the parking device 200 keeps braking action.

Under the condition that the pressure of the locking cavity 102 is increased after the liquid is injected again, the locking piece 150 is switched from the locking rod body 121 to the releasing rod body 121, after the pressure of the hydraulic cavity 101 is released, the elastic reset piece 140 resets to push the movable sleeve 120 to move leftwards along the axial direction of the hydraulic driving device 100, so that the limiting piece 130 rotates around the axial direction of the hydraulic driving device 100, the movable sleeve 120 drives the parking zipper 500 to move leftwards along the axial direction of the hydraulic driving device 100, and the parking zipper 500 drives the parking device 200 to execute the brake release action.

Referring to fig. 7 and 8 together, the hydraulic drive apparatus 100 further includes a flexible boot 160, a first seal ring 161, a second seal ring 162, a spacer 163, a first gasket 164, a second gasket 165, a first planar bearing 166, a second planar bearing 167, a third seal ring 168, and a fourth seal ring 169. The first shim 164 and the second shim 165 are made of steel. Spacer 163 is made of copper. The flexible shield 160 is sleeved on the moving sleeve 120 and the outer housing 110 to shield a gap between the moving sleeve 120 and the outer housing 110, prevent foreign matters such as water or dust from entering the gap between the moving sleeve 120 and the outer housing 110, and further prevent foreign matters such as water or dust from entering the stroke cavity 177. The first sealing ring 161 is installed on the inner wall of the outer housing 110 and is located between the rod body 121 of the moving sleeve 120 and the outer housing 110, so as to isolate the hydraulic chamber 101 from the outside and prevent the hydraulic chamber 101 from leaking to the outside. The second sealing ring 162 is mounted on the sliding guide protrusion 122 and located between the sliding guide protrusion 122 and the outer housing 110, and is used for isolating the hydraulic chamber 101 from the movable chamber, and preventing the hydraulic chamber 101 from leaking to the movable chamber.

The spacer 163 is located between the limiting member 130 and the outer housing 110, separates the limiting member 130 from the outer housing 110, and has a flatness greater than that of the outer housing 110, when the limiting member 130 rotates, the limiting member 130 contacts with the spacer 163, and does not contact with the outer housing 110, so that the resistance of the limiting member 130 to rotation can be reduced. It will be appreciated that spacer 163 is made of copper and that outer housing 110 and stop 130 are both made of iron. Because of the difference of manufacturing process, the smoothness of the outer housing 110 and the spacing member 130 is low, and the smoothness of the spacer 163 can be processed to be high, so that the friction force is small when the spacing member 130 contacts with the spacer 163, and the resistance to rotation of the spacing member 130 can be reduced.

The first gasket 164 and the first plane bearing 166 are installed in the locking cavity 102, and the first gasket 164 separates the first plane bearing 166 from the outer housing 110, so that the outer housing 110 is prevented from being deformed when the balls of the first plane bearing 166 roll, and the outer housing 110 is prevented from being pressed; the first plane bearing 166 is located between the first spacer 164 and the limiting member 130, and the balls of the first plane bearing 166 contact the limiting member 130, so as to reduce friction when the limiting member 130 rotates, and make the limiting member 130 smoothly rotate. The second washer 165 and the second planar bearing 167 are mounted in the lock chamber 102, and the second washer 165 separates the second planar bearing 167 from the lock member 150, preventing the lock member 150 from being pressed when the balls of the second planar bearing 167 rotate; the second flat bearing 167 is located between the second washer 165 and the stopper 130, and the balls of the second flat bearing 167 are in contact with the stopper 130 to reduce friction when the stopper 130 rotates. The third seal 168 and the fourth seal 169 are used to seal off the locking chamber 102.

Specifically, the outer housing 110 includes a travel sleeve 170 and a lock sleeve 180. Referring to fig. 9, the stroke sleeve 170 has a cylindrical shape, and the stroke sleeve 170 is provided with a first axial through hole 171, a first inlet/outlet 172, a first exhaust port 173, a first annular groove 174, and a first seal groove 175. The first axial through hole 171 penetrates the travel sleeve 170 along the axial direction of the travel sleeve 170, the first axial through hole 171 comprises a first hole 176 and a travel cavity 177 which are coaxial, the inner diameter of the first hole 176 is smaller than that of the travel cavity 177, an abutting wall 178 is formed between the first hole 176 and the travel cavity 177, namely, the travel cavity 177 is close to the cavity wall of the first hole 176 to form the abutting wall 178, the abutting wall 178 is used for limiting the movement of the movable sleeve 120, the hole wall of the first hole 176 is provided with an annular first sealing groove 175, and the first sealing groove 175 is used for installing the first sealing ring 161. The portion of the stroke chamber 177 that communicates with the first hole 176 forms the hydraulic chamber 101. The first inlet and outlet 172 and the first exhaust port 173 are both arranged on the peripheral wall of the stroke sleeve 170 and are both communicated with the hydraulic cavity 101; the first inlet/outlet 172 is used for allowing hydraulic oil to enter or flow out of the hydraulic chamber 101, and the first exhaust port 173 is used for allowing gas in the hydraulic chamber 101 to be exhausted. The first annular groove 174 is disposed on an outer wall surface of the travel sleeve 170 facing away from the first hole 176, and surrounds the travel sleeve 170 circumferentially, and the first annular groove 174 is used for connecting the flexible protection cover 160. The outer wall surface of the travel sleeve 170, which faces away from the travel cavity 177, is provided with an annular thread segment 179, the annular thread segment 179 protrudes relative to the outer wall surface of the travel sleeve 170 and surrounds the travel sleeve 170 circumferentially for one circle, and the annular thread segment 179 is used for connecting the locking sleeve 180.

Referring to fig. 10, the locking sleeve 180 has a cylindrical shape and includes a sleeve body 181 and a barrier 182. The sleeve body 181 is provided with a second axial through hole 183, a second inlet/outlet 184, and a second exhaust port 185, and the second axial through hole 183 penetrates the lock sleeve 180 in the axial direction of the lock sleeve 180. The baffle plate 182 is fixed in the second axial through hole 183, dividing the second axial through hole 183 into a first screw hole 186 and a mounting hole 187, the mounting hole 187 including a receiving hole 188 and a second screw hole 189, the receiving hole 188 being located between the first screw hole 186 and the second screw hole 189. The baffle plate 182 is provided with an axial through hole 1821 that communicates with the first threaded bore 186 and the receiving bore 188. The first threaded bore 186 and the receiving bore 188 each have an inner diameter that is greater than an inner diameter of the axial through bore 1821. A portion of the receiving bore 188 is used to form the locking cavity 102. The second inlet and outlet 184 and the second exhaust port 185 are both arranged on the peripheral wall of the locking sleeve 180 and are both communicated with the locking cavity 102; the second inlet and outlet 184 is used for hydraulic oil to enter or exit the locking chamber 102, and the second exhaust port 185 is used for gas to exit the locking chamber 102. The first axial through hole 171 and the mounting hole 187 constitute an axial through hole of the outer case.

The travel sleeve 170 is fixedly coupled with the locking sleeve 180 to form the outer housing 110. Specifically, the annular threaded segment 179 of the travel sleeve 170 is located within the first threaded bore 186 of the lock sleeve 180 and is threadably engaged with the first threaded bore 186, and one end of the travel sleeve 170 abuts the stop plate 182 of the lock sleeve 180.

Referring to fig. 11, the moving sleeve 120 includes the rod body 121 and the slide guide protrusion 122 described above, and further includes a stopper protrusion 123. The rod body 121 has a cylindrical shape and is provided with a third axial through hole 124, a second annular groove 125 and a second seal groove 126. The third axial through hole 124 includes a third screw hole 127, a middle hole 128, and a fourth screw hole 129 sequentially arranged in the axial direction of the moving sleeve 120, the third screw hole 127 being used to connect the parking lock 500, and the fourth screw hole 129 being used to connect the stopper 130. The outer circumferential surface of the rod body 121 facing away from the fourth threaded hole 129 is convexly provided with the above-mentioned slide guide protrusion 122 and the stop protrusion 123, and the slide guide protrusion 122 and the stop protrusion 123 are spaced apart in the axial direction of the moving sleeve 120. The second annular groove 125 is disposed on the outer peripheral surface of the rod 121 facing away from the third threaded hole 127, and surrounds the rod 121 circumferentially, and the second annular groove 125 is used for connecting the flexible protection cover 160. The second sealing groove 126 is disposed on an outer peripheral surface of the sliding guide protrusion 122 facing away from the rod body 121, and is used for mounting the second sealing ring 162.

Referring to fig. 12 and 13, the limiting member 130 is cylindrical, and includes a coaxial and sequentially fixedly connected rotating rod and a limiting rod 133, the rotating rod includes a fixedly connected threaded rod 131 and a connecting rod 132, the connecting rod 132 is located between the threaded rod 131 and the limiting rod 133, the outer diameters of the threaded rod 131 and the connecting rod 132 are the same, the outer diameter of the limiting rod 133 is larger than that of the connecting rod 132, two opposite ends of the limiting rod 133 along the axial direction of the limiting member 130 are respectively a first wall surface 134 and a second wall surface 135, the first wall surface 134 faces the connecting rod 132, and the second wall surface 135 faces away from the connecting rod 132. The limiting rod 133 is provided with a third sealing groove 138 and a limiting groove 136, and the third sealing groove 138 is positioned on the outer circumferential surface of the limiting rod 133 and is used for installing a third sealing ring 168; the limiting groove 136 is located on the second wall surface 135, a first limiting saw tooth 137 is disposed on a wall surface of the limiting groove 136, and the limiting groove 136 is used for connecting the locking piece 150.

Referring to fig. 14, the locking member 150 includes a locking lever 151, a locking housing including a connecting sleeve 152 and a locking plug 153, and a locking elastic member 154, the connecting sleeve 152 and the locking plug 153 being fixedly connected by threads. In other embodiments, the lock housing may be integrally formed. The locking shell is provided with a locking hole.

Referring to fig. 15, the locking lever 151 includes a locking section 155, a sliding section 156, and an anti-rotation protrusion 156a coaxially and sequentially fixed, the anti-rotation protrusion 156a being protruded with respect to an outer surface of the sliding section 156 for cooperating with the connecting sleeve 152 to restrict rotation of the locking lever 151. The outer peripheral surface of the locking section 155 is provided with a second limiting saw tooth 1551, the locking section 155 is used for being connected with the limiting groove 136, and the second limiting saw tooth 1551 is used for being meshed with the first limiting saw tooth 137; the slide segment 156 is adapted to mate with the connection sleeve 152.

Referring to fig. 16, the connecting sleeve 152 has a cylindrical shape, the connecting sleeve 152 includes a first connecting section 157 and a second connecting section 158 coaxially fixed, the first connecting section 157 includes a first threaded section, the second connecting section 158 includes a second threaded section, the first threaded section is configured to mate with the second threaded hole 189 of the connecting sleeve 152, and the second threaded section is configured to mate with the locking plug 153. The connecting sleeve 152 is provided with a fourth axial through hole 159 penetrating along the axial direction, the fourth axial through hole 159 comprises a guide sliding hole 1591 and a storage hole 1592 which are coaxially and sequentially communicated, the guide sliding hole 1591 is used for installing the locking rod 151, the hole wall of the guide sliding hole 1591 is provided with a fourth sealing groove 1593, the fourth sealing groove 1593 is used for installing a fourth sealing ring 169, and the storage hole 1592 is used for installing the locking elastic piece 154. The hole wall surface of the slide guiding hole 1591 is provided with an anti-rotation groove for cooperating with the anti-rotation protrusion 156a to limit the rotation of the locking lever 151.

Referring to fig. 17, the locking plug 153 is cylindrical, a stop hole 1531 is provided, the stop hole 1531 penetrates through one end wall surface of the locking plug 153, and a connection column 1532 is provided in the stop hole 1531. The fourth axial through hole 159 and the stopper hole 1531 constitute the above-described locking hole.

Referring to fig. 6 to 8, a portion of the rod body 121 of the moving sleeve 120, the stop protrusion 123 and the slide guide protrusion 122 are located in the stroke cavity 177, and the slide guide protrusion 122 is in contact with the cavity wall of the stroke cavity 177, and the stop protrusion 123 can abut against the abutment wall 178 of the stroke sleeve 170. Another portion of the rod 121 is positioned within the first bore 176 of the travel sleeve 170 and is in clearance fit with the first bore 176 of the travel sleeve 170. A further portion of the rod 121 is located outside of the stroke cavity 177. The portion of the travel cavity 177 between the slide guide 122 of the shift collar 120 and the abutment wall 178 forms the hydraulic chamber 101.

The flexible protective sleeve is sleeved on the part of the rod body 121 located at the outer side of the stroke cavity 177 and the stroke sleeve 170, one end of the flexible protective sleeve is clamped in the first annular groove 174 of the stroke sleeve 170, and the other end of the flexible protective sleeve is clamped in the second annular groove 125 of the rod body 121.

The threaded rod 131 of the limiting piece 130 is positioned in the stroke cavity 177, and the threaded rod 131 extends into the fourth threaded hole 129 of the movable sleeve 120 and is in threaded connection with the fourth threaded hole 129; a portion of the connecting rod 132 of the stopper 130 is located in the axial through hole 1821 of the barrier 182; the other portion of the connecting rod 132 of the stopper 130 and the stopper rod 133 are positioned in the receiving hole 188 of the locking sleeve 180.

The elastic restoring member 140 is located in the movable cavity, the elastic restoring member 140 is sleeved on the rod body 121 of the moving sleeve 120 of the limiting member 130 and the connecting rod 132 of the limiting member 130, and two opposite ends of the elastic restoring member 140 are respectively and fixedly connected with the baffle 182 of the locking sleeve 180 and the sliding guide protrusion 122 of the moving sleeve 120.

The first connection section 157 of the connection sleeve 152 is positioned in the second threaded hole 189 of the locking sleeve 180, and the first threaded section is screwed with the second threaded hole 189 so that the connection sleeve 152 is fixedly connected with the locking sleeve 180. The second connecting section 158 of the connecting sleeve 152 extends out of the locking sleeve 180, and the first threaded section is located in the stop hole 1531 of the locking plug 153 and is in threaded connection with the stop hole 1531, so that the connecting sleeve 152 is fixedly connected with the locking plug 153, and the connecting post 1532 in the stop hole 1531 is located in the receiving hole 1592 of the connecting sleeve 152. The sliding section 156 of the locking lever 151 is positioned in the sliding guide hole 1591 of the connecting sleeve 152, and the rotation preventing protrusion 156a is positioned in the rotation preventing groove to limit the rotation of the locking lever 151. The locking section 155 of the locking lever 151 is located in the limiting groove 136 of the limiting lever 133, and the first limiting saw tooth 137 is meshed with the second limiting saw tooth 1551, so that the locking lever 151 can limit the rotation of the limiting member 130, that is, the locking lever 151 locks the limiting member 130. The locking elastic member 154 is disposed in the receiving hole 1592 of the connecting sleeve 152 and sleeved on the connecting post 1532 in the stop hole 1531, and opposite ends of the locking elastic member 154 are fixedly connected with the locking rod 151 and the bottom wall surface of the stop hole 1531 respectively.

The first spacer 164, the second spacer 165, the first planar bearing 166 and the second planar bearing 167 are all located in the accommodating hole 188 of the locking sleeve 180, and the first spacer 164 and the first planar bearing 166 are mounted between the baffle 182 and the first wall 134 of the stop lever 133, one surface of the first spacer 164 is abutted against the baffle 182, the other surface is in contact with the balls of the first planar bearing 166, and the balls of the first planar bearing 166 are also in contact with the first wall 134 of the stop lever 133. The second washer 165 and the second planar bearing 167 are installed between the second wall surface 135 of the stopper rod 133 and the end wall surface of the connecting sleeve 152, and one surface of the second washer 165 is in contact with the end wall surface of the connecting sleeve 152, and the other surface is in contact with the balls of the second planar bearing 167, and the balls of the second planar bearing 167 are also in contact with the second wall surface 135 of the stopper rod 133. The portion of the receiving hole 188 between the second wall 135 of the stop lever 133 and the end wall of the connecting sleeve 152 is the locking cavity 102. The spacer 163 is disposed in the axial through hole 1821 of the spacer plate 182 and sleeved on the connecting rod 132 of the limiting member 130.

The first sealing ring 161 is installed in the first sealing groove 175 and is sleeved on the rod body 121 of the moving sleeve 120, and the first sealing ring 161 can seal a gap between the wall of the first hole 176 and the rod body 121 of the moving sleeve 120 so as to prevent oil in the hydraulic chamber 101 from leaking to the outside. The second seal ring 162 is installed in the second seal groove 126 and abuts against the cavity wall of the stroke cavity 177, and the first seal ring 161 can seal a gap between the cavity wall of the stroke cavity 177 and the outer peripheral surface of the sliding guide protrusion 122, so as to prevent oil in the hydraulic cavity 101 from leaking into the movable cavity. The third sealing ring 168 is mounted on the third sealing groove 138 and abuts against the hole wall of the accommodating hole 188 of the connecting sleeve 152, and the third sealing ring 168 can seal a gap between the hole wall of the accommodating hole 188 and the limiting rod 133 of the limiting member 130 to prevent oil leakage. The fourth sealing ring 169 is mounted on the fourth sealing groove 1593 and is sleeved on the sliding section 156 of the locking rod 151, so as to seal a gap between the locking rod 151 and the wall of the sliding guide hole 1591 of the connecting sleeve 152 and prevent oil leakage.

Referring to fig. 18 to 20, the parking device 200 includes a support plate 210, a first shoe spring 220, a second shoe spring 230, a first brake shoe 240, a second brake shoe 250, a connection spring 260, a fixing bracket 270, a parking assembly 280, a connection member 300, and a protective case 400.

Opposite ends of the first shoe pressing spring 220 are respectively connected to the support plate 210 and the first brake shoe 240, and opposite ends of the second shoe pressing spring 230 are respectively connected to the support plate 210 and the second brake shoe 250; the two ends of the connecting spring 260 are respectively connected with the first brake shoe 240 and the second brake shoe 250; the fixing bracket 270 is fixedly coupled to one side of the support plate 210.

Parking assembly 280 is located between first brake shoe 240 and second brake shoe 250; the parking assembly 280 includes a first turret 281 and a second turret 282, the first turret 281 abutting the first brake shoe 240 and the second turret 282 abutting the second brake shoe 250. The first rotating frame 281 is respectively and rotatably connected with the second rotating frame 282 and the fixed bracket 270; the second turret 282 extends through the support plate 210 to a side of the support plate 210 facing away from the stationary bracket 270. The connector 300 is located between the first and second brake shoes 240 and 250 and opposite the park assembly 280, with opposite sides of the connector 300 connecting the first and second brake shoes 240 and 250, respectively.

The protective housing 400 is fixedly connected to the support plate 210, and encloses a portion of the second rotating frame 282 facing away from the fixing bracket 270 to prevent foreign matters such as dust and water from entering the other side of the support plate 210 from around the second rotating frame 282.

When the second rotating frame 282 rotates around the first direction, the first rotating frame 281 can be driven to rotate around the second direction, so that the first rotating frame 281 pushes the first brake shoe 240, the second rotating frame 282 pushes the second brake shoe 250, the first brake shoe spring 220 and the second brake shoe spring 230 deform, the first brake shoe 240 and the second brake shoe 250 overcome the elastic force of the connecting spring 260, and the first brake shoe 240 and the second brake shoe 250 are far away from each other; the first direction and the second direction are opposite.

The brake drum is in a circular shell shape with one side open, and is provided with a hollow chamber, and after the first brake shoe 240 and the second brake shoe 250 of the brake device are far away from each other, the brake device can be contacted with the inner wall surface of the hollow chamber so as to realize parking. The method comprises the following steps: the portion of the second turret 282 extending beyond the support plate 210 is fixedly coupled to the park lock 500. When parking is needed, the parking zipper 500 is pulled rightward by the hydraulic driving device 100, the parking zipper 500 drives the second rotating frame 282 to rotate anticlockwise, the second rotating frame 282 drives the first rotating frame 281 to rotate clockwise, so that the first rotating frame 281 pushes the first brake shoe 240, the second rotating frame 282 pushes the second brake shoe 250, the first brake shoe 240 and the second brake shoe 250 overcome the elastic force of the connecting spring 260, the connecting spring 260 is stretched, the first brake shoe 240 and the second brake shoe 250 are far away from each other, at the moment, the first brake shoe 240 and the second brake shoe 250 are respectively contacted with the brake drum to generate friction force on the brake drum, the brake drum is stopped rotating, and wheels connected with the brake drum are stopped rotating, so that parking is realized.

When parking is released, the parking zipper 500 is pulled leftwards by the hydraulic driving device 100, the parking zipper 500 drives the second rotating frame 282 to rotate clockwise, the second rotating frame 282 drives the first rotating frame 281 to rotate anticlockwise, so that the first rotating frame 281 is far away from the first brake shoe 240, the second rotating frame 282 is far away from the second brake shoe 250, at the moment, the force generated by the first brake shoe 240 and the second brake shoe 250 on the brake drum disappears, the connecting spring 260 is reset, the first brake shoe 240 and the second brake shoe 250 are driven to be far away from the brake drum, and the first brake shoe 240 and the second brake shoe 250 are close to each other, so that parking is released.

Referring to fig. 21, the support plate 210 is in a circular thin plate shape, and is provided with a connection hole 211, a first clamping hole 212 and a second clamping hole 213, wherein the connection hole 211, the first clamping hole 212 and the second clamping hole 213 all penetrate through the support plate 210 along the thickness direction of the support plate 210, the connection hole 211 is used for allowing a parking assembly 280 to pass through, the first clamping hole 212 is used for connecting the first shoe pressing spring 220, and the second clamping hole 213 is used for connecting the second shoe pressing spring 230.

Referring to fig. 22 and 23, the first shoe spring 220 may be elastically deformed, and includes a first clamping portion 221, an intermediate connecting portion 222, and a second clamping portion 223, wherein the first clamping portion 221 and the second clamping portion 223 are fixedly connected to opposite ends of the intermediate connecting portion 222, the first clamping portion 221 protrudes to both sides with respect to the intermediate connecting portion 222, and the second clamping portion 223 protrudes to both sides with respect to the intermediate connecting portion 222. The first clamping portion 221 has an annular structure, and has a buffer opening 224, a first connecting end and a second connecting end, where two sides of the buffer opening 224 are the first connecting end and the second connecting end respectively. The first clamping portion 221 includes a first clamping section 2211, a buffer section 2212 and a second clamping section 2213, and the first clamping section 2211 and the second clamping section 2213 are all in an annular structure with an opening. The buffer segment 2212 is opposite to the buffer opening 224, and has an arc shape, and a convex side of the buffer segment 2212 faces the buffer opening 24. Two ends of the buffer segment 2212 are respectively and fixedly connected with one end of the first clamping segment 2211 and one end of the second clamping segment 2213, and the first clamping segment 2211 and the second clamping segment 2213 are symmetrically distributed on two sides of the buffer segment 2212. The other end of the first clamping section 2211 forms the first connection end, and the other end of the second clamping section 2213 forms the second connection end. The first clamping section 2211 has elastic deformation capability, and the buffer section 2212 is arc-shaped, so that the elasticity of the first clamping section 2211 can be increased, and the first clamping section 2211 is prevented from being rigidly deformed. The first clamping section 2211 and the second clamping section 2213 are both used for clamping with the support plate 210 so as to facilitate connection of the support plate 210 and the first brake shoe 240.

The middle connecting portion 222 includes a first straight section 225 and a second straight section 226, the first straight section 225 and the second straight section 226 are parallel to each other, one end of the first straight section 225 is fixedly connected with the other end of the first clamping section 2211, and one end of the second straight section 226 is fixedly connected with the other end of the second clamping section 2213. The first and second straight sections 225 and 226 allow the first shoe spring 220 to have a sufficient length to connect the support plate 210 and the first brake shoe 240.

The second clamping portion 223 includes a first arc-shaped section 227 and a second arc-shaped section 228, one end of the first arc-shaped section 227 is fixedly connected with the other end of the first straight section 225, and one end of the second arc-shaped section 228 is fixedly connected with the second straight section 226. The first arc segment 227 and the second arc segment 228 are arc-shaped and respectively protrude towards the direction away from the middle connecting portion 222, so that the first shoe pressing spring 220 is convenient to disassemble and assemble, specifically, the second clamping segment 2213 is convenient to penetrate through the first brake shoe 240, so that the second clamping segment 2213 is clamped with the first brake shoe 240, and the first shoe pressing spring 220 is convenient to disassemble.

The structure of the second shoe spring 230 is the same as that of the first shoe spring 220, and reference is made to the description of the first shoe spring 220 for specific structure and connection of the components.

Referring to fig. 24, the first brake shoe 240 has an arc shape, and includes a first connection plate 241 and a first brake plate 242, one side of the first brake plate 242 is fixedly connected with one side of the first connection plate 241, and the first brake plate 242 is perpendicular to the first connection plate 241. The first connection plate 241 is provided with a first avoidance hole 243, a first perforation 244 and a second perforation 245, the first avoidance hole 243, the first perforation 244 and the second perforation 245 all penetrate through the first connection plate 241 along the thickness direction of the first connection plate 241, the first avoidance hole 243 is used for allowing the first shoe pressing spring 220 to penetrate through, and the first perforation 244 and the second perforation 245 are used for being connected with the connection spring 260. The first connecting plate 241 has a first mating groove 246 and a second mating groove 247 at two ends, the first mating groove 246 is used for being clamped with the first rotating frame 281, and the second mating groove 247 is used for being connected with the connecting piece 300.

The second brake shoe 250 has the same structure as the first brake shoe 240, and includes a second connection plate 251 and a second brake plate 252, the second connection plate 251 is provided with a second avoidance hole 253, a third through hole 254 and a fourth through hole 255, the second avoidance hole 253 is used for allowing the second shoe pressing spring 230 to pass through, and the third through hole 254 and the fourth through hole 255 are used for being connected with the connection spring 260. The two ends of the second connecting plate 251 are respectively provided with a third matching groove 256 and a fourth matching groove 257, the third matching groove 256 is used for being clamped with the second rotating frame 282, and the fourth matching groove 257 is used for being connected with the connecting piece 300.

Referring to fig. 25, the connection spring 260 includes a first elastic member 261 and a second elastic member 262, the first elastic member 261 includes a first screw section 263, a first connection hook 264 and a second connection hook 265, and the first connection hook 264 and the second connection hook 265 are connected to opposite ends of the first screw section 263, respectively. The first coupling hooks 264 are for coupling with the first through holes 244 of the support plate 210, and the second coupling hooks 265 are for coupling with the third through holes 254 of the support plate 210. The second elastic member 262 includes a second screw section 266, a third connection hook 267 and a fourth connection hook 268, the third connection hook 267 and the fourth connection hook 268 being connected to opposite ends of the second screw section 266, respectively, the third connection hook 267 being adapted to be connected with the second through hole 245 of the support plate 210, and the fourth connection hook 268 being adapted to be connected with the fourth through hole 255 of the support plate 210.

Referring to fig. 26, the fixing bracket 270 includes a first fixing plate 271, a second fixing plate 272, a first connection shaft 273, a first pin pipe 274, a second pin pipe 275, and a first split pin 276, and the first fixing plate 271 and the second fixing plate 272 are fixedly connected with the support plate 210, respectively. The first fixing plate 271 and the second fixing plate 272 are disposed opposite to each other with a space therebetween, and the first connection shaft 273 is disposed between the first fixing plate 271 and the second fixing plate 272 and fixedly connected to the first fixing plate 271 and the second fixing plate 272. The first pin tube 274, the second pin tube 275 and the first cotter pin 276 are adapted to cooperate with the first connecting shaft 273 such that the first rotating frame 281 of the parking assembly 280 is rotatably connected to the fixed bracket 270.

Referring to fig. 27 and 28, the parking assembly 280 includes a first turret 281 and a second turret 282, and further includes a second connecting shaft 293 and a second cotter pin 292. The first rotating frame 281 comprises a first rotating plate 283, a first middle connecting plate 284 and a second rotating plate 285, wherein two opposite sides of the first middle connecting plate 284 are respectively and fixedly connected with the first rotating plate 283 and the second rotating plate 285, the first rotating plate 283 and the second rotating plate 285 are opposite and are arranged at intervals, the first rotating plate 283 and the second rotating plate 285 are respectively provided with a first clamping groove 286, and the first clamping grooves 286 are used for being mutually clamped with the first matching grooves 246 of the first brake shoes 240. The second rotating frame 282 of the parking assembly 280 comprises a third rotating plate 287, a second middle connecting plate 288 and a fourth rotating plate 289, two sides of the second middle connecting plate 288 are fixedly connected with the third rotating plate 287 and the fourth rotating plate 289 respectively, the third rotating plate 287 and the fourth rotating plate 289 are opposite and are arranged at intervals, the third rotating plate 287 and the fourth rotating plate 289 are respectively provided with a second clamping groove 290, and the second clamping grooves 290 are used for being mutually clamped with the third matching grooves 256 of the second brake shoes 250. The third rotating plate 287 and the fourth rotating plate 289 are also provided with third clamping grooves 291, and the third clamping grooves 291 are used for connecting the parking lock 500. The fourth rotation plate 289 has a height smaller than that of the third rotation plate 287. The first and second clamping grooves 286, 290 are located on opposite sides of the parking assembly 280. The second connecting shaft 293 and the second cotter 292 serve to rotatably connect the first rotating frame 281 and the second rotating frame 282.

In the present embodiment, referring to fig. 29 and 30, the first rotary frame 281 is rotatably coupled to the fixed bracket 270 through the first coupling shaft 273. Specifically, at least a portion of the first rotating frame 281 is located in the space between the first fixing plate 271 and the second fixing plate 272, the first connecting shaft 273 sequentially penetrates through the first fixing plate 271, the first rotating plate 283, the second rotating plate 285 and the second fixing plate 272, and extends out of one side of the second fixing plate 272 away from the first fixing plate 271, a first pin tube 274 and a second opening pin 292 are disposed on one side of the first connecting shaft 273 extending out of the second fixing plate 272 away from the first fixing plate 271, and a second pin tube 275 is disposed on one side of the first connecting shaft 273 extending out of the first fixing plate 271 away from the second fixing plate 272.

The first and second rotating frames 281 and 282 are rotatably coupled by a second coupling shaft 293. The third rotating plate 287 is at least partially located in the space between the first and second rotating plates 283 and 285, and the second connecting shaft 293 penetrates the first, third and second rotating plates 283 and 287 and 285 and protrudes out of the second rotating plate 285. The portion of the second connecting shaft 293 extending beyond the second rotatable plate 285 engages a first cotter pin 276.

The first and second brake shoes 240 and 250, the first rotating frame 281 and the fixing frame 270 are located at the same side of the support plate 210, and the concave portions of the first and second brake shoes 240 and 250 are opposite, and the first and third engaging grooves 246 and 256 of the first and second brake shoes 240 and 250 are spaced opposite; the second mating groove 247 of the first brake shoe 240 is spaced opposite the fourth mating groove 257 of the second brake shoe 250.

A portion of the first rotating frame 281 and a portion of the second rotating frame 282 are located in a space between the first and third fitting grooves 246 and 256, the third rotating plate 287 of the second rotating frame 282 passes through the connection hole 211 of the support plate 210, and a portion of the fourth and third rotating plates 289 and 287 are located at a side of the support plate 210 facing away from the fixed bracket 270. The first engagement groove 246 of the first brake shoe 240 is engaged with the first engagement groove 286. The third fitting groove 256 of the second brake shoe 250 is engaged with the second engaging groove 290.

The connecting member 300 is located in a space between the second engagement groove 247 of the first brake shoe 240 and the fourth engagement groove 257 of the second brake shoe 250, and opposite sides of the connecting member 300 extend into the second engagement groove 247 and the fourth engagement groove 257, respectively, and abut against groove wall surfaces of the second engagement groove 247 and the fourth engagement groove 257.

The middle connecting portion 222 of the first shoe press 220 passes through the first avoidance hole 243 and the first clamping hole 212, the first clamping portion 221 abuts against one side of the first connecting plate 241, which is away from the support plate 210, and the second clamping portion 223 abuts against one side of the support plate 210, which is away from the first brake shoe 240, so that the first shoe press 220 connects the first brake shoe 240 and the support plate 210, and the middle connecting portion 222 of the first shoe press 220 can move in the left-right direction in the first avoidance hole 243.

The second intermediate connection portion of the second shoe press spring 230 passes through the second avoidance hole 253 and the second clamping hole 213, the third clamping portion abuts against one side of the second connection plate 251, which is away from the support plate 210, and the fourth clamping portion abuts against one side of the support plate 210, which is away from the second brake shoe 250, so that the second shoe press spring 230 connects the second brake shoe 250 and the support plate 210, and the second intermediate connection portion of the second shoe press spring 230 can move in the left-right direction in the second avoidance hole 253.

The first coupling hook 264 of the first elastic member 261 is coupled to the first through hole 244 of the first brake shoe 240, and the second coupling hook 265 of the first elastic member 261 is coupled to the third through hole 254 of the second brake shoe 250. The second coupling hook 265 of the second elastic member 262 is coupled to the second through hole 245 of the first brake shoe 240, and the fourth coupling hook 268 of the second elastic member 262 is coupled to the fourth through hole 255 of the second brake shoe 250.

The protective housing 400 is fixed to a side of the support plate 210 facing away from the first brake shoe 240 and the like, and surrounds the connection hole 211 of the support plate 210.

Referring to fig. 31, the parking zip-lock 500 includes a rope 510, a fixing block 520 and a clamping block 530, the fixing block 520 and the clamping block 530 are respectively fixedly connected to opposite ends of the rope 510, an external thread is provided on the outer circumference of the fixing block 520, and the fixing block 520 is located in the third threaded hole 127 of the rod body 121 of the moving sleeve 120 and is screwed with the third threaded hole 127, so that the fixing block 520 is fixedly connected to the rod body 121 of the moving sleeve 120. The clamping block 530 is columnar and is clamped with the third clamping grooves 291 on the third rotating plate 287 and the fourth rotating plate 289, so that the clamping block 530 is fixedly connected with the second rotating frame 282.

The outer side of the travel sleeve 170 is fixedly coupled to the support base 600 by four fasteners 601 such that the parking device 200 is fixedly coupled to the support base 600. The support base plate 600 is sleeved on the protective housing 400 away from the parking device 200. So that the hydraulic drive device 100 is connected to the support base 600.

In this embodiment, when the vehicle is running normally, the hydraulic chamber 101 and the locking chamber 102 are in a pressure release state, the locking section 155 of the locking lever 151 is located in the limiting groove 136 of the limiting lever 133, the first limiting saw tooth 137 and the second limiting saw tooth 1551 are engaged with each other, the stop protrusion 123 of the moving sleeve 120 abuts against the abutment wall 178 of the travel sleeve 170, at this time, the limiting member 130 is fixedly connected with the locking lever 151, and the locking lever 151 limits the rotation of the limiting member 130, so that the limiting member 130 limits the movement of the moving sleeve 120.

When the vehicle needs to be parked, hydraulic oil is injected into the locking cavity 102 from the first inlet and outlet 172, so that the pressure in the locking cavity 102 is gradually increased, the pressure generated by the hydraulic oil pushes the locking rod 151, the locking section 155 of the locking rod 151 is separated from the limiting groove 136 of the limiting rod 133, the locking rod 151 presses the locking elastic piece 154 and abuts against the connecting column 1532, and the locking elastic piece 154 is compressed by the locking rod 151. At this time, the locking rod 151 is separated from the limiting member 130, and the locking of the limiting member 130 by the locking rod 151 is released, so that the limiting member 130 can rotate around its axial direction. Then, hydraulic oil is injected into the hydraulic chamber 101 from the second inlet and outlet 184, so that the pressure in the hydraulic chamber 101 is gradually increased, and the pressure generated by the hydraulic oil pushes the sliding guide protrusion 122, so that the sliding guide protrusion 122 and the rod 121 gradually move towards the moving chamber (rightward), that is, the rod 121 gradually moves towards the inside of the stroke chamber 177. In the moving process of the slide guide protrusion 122 and the rod body 121, the limiting piece 130 rotates along with the movement of the rod body 121, and the threaded rod 131 of the limiting piece 130 gradually moves into the fourth threaded hole 129 of the moving sleeve 120, so that the limiting piece 130 is prevented from affecting the movement of the rod body 121. At this time, the length of the rod 121 exposed outside the stroke cavity 177 is gradually shortened, and the rod 121 drives the flexible protection cover 160 to gradually fold so as to match the length of the exposed part of the rod 121; at the same time, the elastic restoring member 140 is compressed by the slide guide 122.

When the rod 121 gradually moves towards the inside of the travel cavity 177, the fixing block 520 of the parking zipper 500 is driven to move, so that the rope 510 pulls the clamping block 530, the clamping block 530 drives the second rotating frame 282 to rotate clockwise around the second connecting shaft 293, and the second rotating frame 282 drives the first rotating frame 281 to rotate anticlockwise around the first connecting shaft 273 and the second connecting shaft 293. At least portions of the first and second rotating frames 281 and 282 are moved away from each other, the angle therebetween increases, the first rotating frame 281 pushes the first brake shoe 240, the second rotating frame 282 pushes the second brake shoe 250 such that the first and second brake shoes 240 and 250 are moved away from each other against the elastic force of the first and second elastic members 261 and 262, and at this time, both the first spiral section 263 of the first elastic member 261 and the second spiral section 266 of the second elastic member 262 are stretched, the first shoe pressing spring 220 is displaced in the first escape hole 243, and the second shoe pressing spring 230 is displaced in the second escape hole 253. The first brake shoe 240 and the second brake shoe 250 are both in contact with the inner wall surface of the hollow chamber of the brake drum, and generate friction force with the inner wall surface of the hollow chamber of the brake drum, and the friction force brakes the brake drum, so that the brake drum stops rotating, and wheels connected with the brake drum stop rotating, and parking is achieved.

The lock chamber 102 is then depressurized through the first exhaust port 173 such that the pressure in the lock chamber 102 is reduced. At this time, the locking elastic member 154 is reset to drive the locking rod 151 to move leftwards, so that the locking section 155 of the locking rod 151 is located in the limiting groove 136 of the limiting rod 133, and the first limiting saw tooth 137 and the second limiting saw tooth 1551 are engaged with each other. The stopper 130 is locked by the locking lever 151 to be unable to rotate, and the moving sleeve 120 is restricted by the stopper 130 to be unable to move, so that the parking zip lock 500 maintains a state of applying force to the second turret 282, so that the first brake shoe 240 and the second brake shoe 250 maintain a state of contact with the brake drum, the parking force is prevented from being lowered, and maintenance of the parking state is ensured.

When the parking state needs to be released, hydraulic oil is injected into the locking cavity 102 from the first inlet and outlet 172 again, so that the pressure in the locking cavity 102 is gradually increased, the pressure generated by the hydraulic oil pushes the locking rod 151, the locking section 155 of the locking rod 151 is separated from the limiting groove 136 of the limiting rod 133, the locking rod 151 presses the locking elastic piece 154, and the locking elastic piece 154 is compressed by the locking rod 151. At this time, the locking rod 151 is separated from the limiting member 130, and the locking of the limiting member 130 by the locking rod 151 is released, so that the limiting member 130 can rotate around its axial direction. The hydraulic chamber 101 is then depressurized through the second exhaust port 185 so that the pressure in the hydraulic chamber 101 is reduced. At this time, the elastic restoring member 140 is restored to push the moving sleeve 120 to move leftwards, i.e., the rod body 121 gradually moves to the outside of the stroke cavity 177. In the moving process of the rod 121, the limiting piece 130 rotates along with the movement of the rod 121, and the threaded rod 131 of the limiting piece 130 gradually moves out of the fourth threaded hole 129 of the moving sleeve 120, so that the limiting piece 130 is prevented from affecting the movement of the rod 121. At this time, the length of the rod 121 exposed outside the stroke cavity 177 is gradually increased, and the rod 121 drives the flexible protection cover 160 to be gradually unfolded so as to match the length of the exposed part of the rod 121.

When the rod 121 gradually moves towards the outside of the travel cavity 177, the fixing block 520 of the parking zipper 500 is driven to move, so that the rope 510 pulls the clamping block 530, the clamping block 530 drives the second rotating frame 282 to rotate anticlockwise around the second connecting shaft 293, and the second rotating frame 282 drives the first rotating frame 281 to rotate clockwise around the first connecting shaft 273 and the second connecting shaft 293. At least part of the first rotating frame 281 and the second rotating frame 282 are close to each other, the angle between the two is reduced, the pushing force of the first rotating frame 281 to the first brake shoe 240 is reduced or eliminated, the abutting force of the second rotating frame 282 to the third matching groove 256 of the second brake shoe 250 is reduced or eliminated, at this time, the first spiral section 263 of the first elastic piece 261 and the second spiral section 266 of the second elastic piece 262 are reset, the first brake shoe 240 and the second brake shoe 250 are driven to be close to each other, the first shoe pressing spring 220 is moved to a position when the first avoiding hole 243 is not parked, and the second shoe pressing spring 230 is moved to a position when the second avoiding hole 253 is not parked. At this time, the first and second brake shoes 240 and 250 are separated from the inner wall surface of the cavity chamber of the brake drum, and friction force generated on the inner wall surface of the cavity chamber of the brake drum is eliminated, thereby releasing parking.

In this embodiment, the pressure of the locking chamber 102 is increased by injecting hydraulic oil into the locking chamber 102, and the restriction of the stopper 150 on the stopper 130 is released by the pressure, so that the stopper 130 can rotate. Then, hydraulic oil is injected into the hydraulic cavity 101, the pressure of the hydraulic cavity 101 is increased, the movable sleeve 120 is driven to move towards the parking direction by the pressure, and at the moment, the limiting piece 130 rotates along with the movement of the movable sleeve 120, so that the movement of the movable sleeve 120 cannot be influenced, the movable sleeve 120 drives the parking zipper 500, the parking zipper 500 pulls the parking assembly 280, further, the first brake shoe 240 and the second brake shoe 250 are far away from each other, and the first brake shoe 240 and the second brake shoe 250 brake the brake drum. Then, the locking cavity 102 is depressurized, so that the locking piece 150 locks the limiting piece 130 again, so that the limiting piece 130 cannot rotate, and further, the limiting piece 130 limits the movement of the moving sleeve 120.

As can be seen from the above, in the present embodiment, parking is achieved by using the pressure generated by the hydraulic oil in the hydraulic chamber 101, the generated force (parking force) for pulling the parking zip-lock 500 is large, parking can be performed quickly, and the parking reliability is high. In addition, after the parking is achieved, the locking piece 150 locks the limiting piece 130 again by using the pressure generated by the hydraulic oil in the locking cavity 102, so that the locking of the movable sleeve 120 is achieved, the parking stability is improved, and the phenomenon of sliding is avoided even if the vehicle is parked for a long time.

In addition, in this embodiment, the parking device 200 is integrated alone, so that the structure is more compact and space can be saved. And the parking device 200 has the advantages of less parts, simpler structure and easy assembly. And the hydraulic driving device and the parking device are arranged in a laminated mode, so that the structure is more compact, and the space occupied by the whole parking system is less.

In addition, in this embodiment, the first and second shoe springs 220 and 230 are integrally formed, so that the number of parts of the parking device 200 is reduced, the assembly difficulty is reduced, the assembly efficiency is improved, the assembly cost is reduced, and the fatigue condition of staff is reduced.

The foregoing has outlined rather broadly the more detailed description of embodiments of the present application, wherein specific examples are provided herein to illustrate the principles and embodiments of the present application, and wherein the above examples are provided to assist in the understanding of the methods and concepts of the present application.

Claims

1. A hydraulic drive apparatus, comprising: the device comprises an outer shell, a movable sleeve and an elastic reset piece, wherein the outer shell is provided with a travel cavity, and the movable sleeve comprises a rod body and a slide guide protrusion which are fixedly connected; a part of the rod body and the sliding guide protrusion are positioned in the travel cavity, and the sliding guide protrusion is contacted with the cavity wall of the travel cavity so that a part of the travel cavity forms a hydraulic cavity; the other part of the rod body is positioned at the outer side of the stroke cavity;

After hydraulic oil is injected into the hydraulic cavity, the pressure is increased so as to push the slide guide boss and the rod body to move towards the parking direction; after the hydraulic cavity is depressurized, the rod body moves towards the parking releasing direction, and the parking releasing direction is opposite to the parking direction.

2. The hydraulic drive device according to claim 1, further comprising an elastic restoring member, wherein the elastic restoring member is located in the travel cavity and sleeved on the rod body; the two ends of the elastic reset piece are respectively and fixedly connected with the rod body and the cavity wall of the travel cavity; when the rod body moves towards the parking direction, the elastic reset piece is compressed; after the hydraulic cavity is depressurized, the elastic reset piece resets to drive the rod body to move towards the parking releasing direction.

3. The hydraulic drive device according to claim 2, further comprising a locking member and a limiting member, the limiting member being in driving connection with the lever body, the limiting member being rotatable about the parking direction; the locking piece is used for locking the limiting piece so as to limit the rotation of the limiting piece, and the limiting piece limits the movement of the rod body;

The pressure of the hydraulic oil injected into the locking cavity is increased, and the locking piece releases the limit of the limiting piece, so that the limiting piece releases the limit of the rod body.

4. A hydraulic drive as claimed in claim 3, wherein the outer housing is provided with an axial through bore, the outer housing including a baffle separating the axial through bore into the travel chamber and mounting bore; one part of the limiting piece is positioned in the travel cavity and is in transmission connection with the rod body; the other part of the limiting piece penetrates through the baffle plate and extends into the mounting hole, and the limiting piece can rotate around the parking direction; and one part of the locking piece is positioned in the mounting hole and matched with the limiting piece to enable one part of the mounting hole to form a locking cavity, and the locking piece locks the limiting piece in the locking cavity.

5. The hydraulic drive of claim 4, wherein the stop comprises a rotating rod and a stop rod, a portion of the rotating rod being located within the travel cavity and being threaded with the rod body; the other part of the rotating rod penetrates through the baffle plate and extends into the mounting hole, and the limiting rod is located in the mounting hole and matched with the locking piece so that a part of the mounting hole forms the locking cavity.

6. The hydraulic drive of claim 5, wherein the stop is coupled to a gear, the lever is coupled to a rack, and the gear is engaged with the rack.

7. The hydraulic drive of claim 5, wherein the locking member comprises a locking lever and a locking housing; at least part of the locking shell is positioned in the mounting hole and is fixedly connected with the hole wall of the mounting hole, and the locking shell is opposite to and spaced from the limiting rod so that a part of the mounting hole forms the locking cavity; the locking shell is provided with a locking hole; one part of the locking rod is positioned in the locking hole, and the other part of the locking rod is positioned in the locking cavity and is detachably connected with the rotating rod; and after the hydraulic oil is injected into the locking cavity, the pressure is increased, and the locking rod is pushed to move towards the parking direction, so that the locking rod is separated from the rotating rod.

8. The hydraulic drive device according to claim 7, wherein the limit lever is provided with a limit groove, and a first limit saw tooth is arranged in the limit groove; the locking rod comprises a locking section and a sliding section which are fixedly connected, the locking section is provided with second limiting saw teeth, the locking section is located in the limiting groove, the first limiting saw teeth are connected with the second limiting saw teeth in a meshed mode, one part of the sliding section is located in the locking cavity, and the other part of the sliding section is located in the locking hole.

9. The hydraulic drive of claim 8, wherein the locking lever further comprises an anti-rotation protrusion fixedly connected to the sliding section and protruding relative to an outer peripheral surface of the sliding section; the wall surface of the locking hole is provided with an anti-rotation groove, and the anti-rotation protrusion is positioned in the anti-rotation groove to limit the rotation of the locking rod.

10. The hydraulic drive of claim 9, wherein the locking member further comprises a locking spring; the locking elastic piece is positioned in the locking hole, and two ends of the locking elastic piece are respectively and fixedly connected with the locking rod and the hole wall of the locking hole; when the locking rod moves towards the parking direction, the locking elastic piece is compressed;

after the locking cavity is depressurized, the locking elastic piece is reset to drive the locking rod to move in the braking releasing direction, so that the locking rod is connected with the rotating rod.

11. The hydraulic drive of claim 5 further comprising a first planar bearing mounted in the mounting hole and positioned between the baffle plate and the stop lever, the balls of the first planar bearing contacting the stop lever.

12. The hydraulic drive of claim 11, further comprising a first spacer mounted within the mounting hole and located between the first planar bearing and the baffle.

13. The hydraulic drive of claim 5 further comprising a second planar bearing mounted within the lock cavity and positioned between the stop lever and the lock member, the stop lever being in contact with the balls of the second planar bearing.

14. The hydraulic drive of claim 13, further comprising a second shim mounted within the locking cavity and positioned between the second planar bearing and the locking member.

15. The hydraulic drive of claim 4 further comprising a spacer sleeve disposed about the stop member to space the stop member from the baffle plate.

16. The hydraulic drive of any one of claims 1 to 15, further comprising a flexible boot that is sleeved over the moving sleeve and the outer housing, and opposite ends of the flexible boot are fixedly connected to the moving sleeve and the outer housing, respectively.

17. The hydraulic drive device according to any one of claims 2 to 15, wherein the movement sleeve further includes a stopper protrusion fixedly connected to the rod body, a cavity wall of the stroke cavity is formed with an abutment wall, and the stopper protrusion abuts against the abutment wall when the rod body is moved in the parking-release direction.

18. An automobile comprising a vehicle frame and the hydraulic drive device of any one of claims 1 to 17, the hydraulic drive device being mounted to the vehicle frame.